comparison examples/FixedTempoEstimator.h @ 198:e3e61b7e9661

* Beginnings of a simple tempo estimator example plugin

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Vamp
+
+    An API for audio analysis and feature extraction plugins.
+
+    Centre for Digital Music, Queen Mary, University of London.
+    Copyright 2006-2008 Chris Cannam and QMUL.
+  
+    Permission is hereby granted, free of charge, to any person
+    obtaining a copy of this software and associated documentation
+    files (the "Software"), to deal in the Software without
+    restriction, including without limitation the rights to use, copy,
+    modify, merge, publish, distribute, sublicense, and/or sell copies
+    of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
+    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+    Except as contained in this notice, the names of the Centre for
+    Digital Music; Queen Mary, University of London; and Chris Cannam
+    shall not be used in advertising or otherwise to promote the sale,
+    use or other dealings in this Software without prior written
+    authorization.
+*/
+
+#ifndef _FIXED_TEMPO_ESTIMATOR_PLUGIN_H_
+#define _FIXED_TEMPO_ESTIMATOR_PLUGIN_H_
+
+#include "vamp-sdk/Plugin.h"
+
+/**
+ * Example plugin that estimates the tempo of a short fixed-tempo sample.
+ */
+
+class FixedTempoEstimator : public Vamp::Plugin
+{
+public:
+    FixedTempoEstimator(float inputSampleRate);
+    virtual ~FixedTempoEstimator();
+
+    bool initialise(size_t channels, size_t stepSize, size_t blockSize);
+    void reset();
+
+    InputDomain getInputDomain() const { return FrequencyDomain; }
+
+    std::string getIdentifier() const;
+    std::string getName() const;
+    std::string getDescription() const;
+    std::string getMaker() const;
+    int getPluginVersion() const;
+    std::string getCopyright() const;
+
+    size_t getPreferredStepSize() const;
+    size_t getPreferredBlockSize() const;
+
+    ParameterList getParameterDescriptors() const;
+    float getParameter(std::string id) const;
+    void setParameter(std::string id, float value);
+
+    OutputList getOutputDescriptors() const;
+
+    FeatureSet process(const float *const *inputBuffers,
+                       Vamp::RealTime timestamp);
+
+    FeatureSet getRemainingFeatures();
+
+protected:
+    size_t m_stepSize;
+    size_t m_blockSize;
+
+    float *m_priorMagnitudes;
+
+    size_t m_dfsize;
+    float *m_df;
+    size_t m_n;
+
+    Vamp::RealTime m_start;
+    Vamp::RealTime m_lasttime;
+
+    FeatureSet calculateFeatures();
+    float lag2tempo(int);
+};
+
+
+#endif